The **L3-R22-10** is a specific type of **Power Inductor**, commonly used in surface-mount technology (SMT) applications. It is designed to store energy in a magnetic field when electric current flows through it. ### 1. Part Number Breakdown Typically, manufacturers follow a standard nomenclature for these components: | Component Segment | Definition | Description | | :--- | :--- | :--- | | **L3** | Series/Case Size | Refers to the physical dimensions (e.g., 3mm x 3mm). | | **R22** | Inductance Value | **0.22 µH** (R acts as a decimal point). | | **10** | Tolerance | Usually indicates **±10%** tolerance. | --- ### 2. Core Technical Specifications While exact specs vary by manufacturer (such as Sumida, TDK, or Bourns), a typical **R22** (0.22µH) inductor in this class features: * **Inductance:** 0.22 Microhenries (µH). * **DCR (DC Resistance):** Very low (typically in the range of 5mΩ to 15mΩ) to minimize power loss. * **Saturation Current ($I_{sat}$):** High current capacity, often ranging from 5A to 15A depending on the body size. * **Operating Temperature:** Generally rated for $-40^\circ\text{C}$ to $+125^\circ\text{C}$. --- ### 3. Internal Construction The electronic parts of this inductor consist of: 1. **Magnetic Core:** Usually made of Ferrite or Metal Alloy powder. This enhances the magnetic flux and defines the saturation limits. 2. **Copper Winding:** A flat or round copper wire wound around the core. In "R22" models, the number of turns is low to achieve low inductance. 3. **Terminations:** Solder pads (usually tin-plated) located on the bottom for PCB mounting. 4. **Shielding:** Most L3 series inductors are **shielded**, meaning the magnetic field is contained to prevent interference with nearby components (EMI). --- ### 4. Common Applications Due to its low inductance and high current handling, the L3-R22-10 is primarily used in: * **DC-DC Converters:** Buck or Boost converters in smartphones and laptops. * **Voltage Regulator Modules (VRM):** Providing stable power to CPUs/GPUs. * **High-Frequency Switching:** Suitable for circuits operating in the 1MHz to 5MHz range. ---